At the end of each episode of My Little Pony: Friendship is Magic, one of the show's cartoon ponies dictates a letter to the pegacorn Princess Celestia, telling her what she's learned about friendship. Not to be outdone, Portal's villainous AI GlaDOS gets in on the act, and she has a request for the princess. »1/15/12 11:30am 1/15/12 11:30am